Brake device for elevator

Details Brake device for elevator Brake device for elevator

2002-08-09

2004-12-14

Lillis, Eileen D. (Department: 3652)

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific means contacting or on load support for...

Includes movable contact component on support for engaging...

C187S271000

Reexamination Certificate

active

06830132

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a brake device for elevator, and more particularly, a brake device for elevator by use of hydraulic pressure generated by fall in construction work or building to enable the brake pad to brake the elevator, thereby preventing free fall or crash accident of the elevator.
BACKGROUND ART
Conventional elevator used in construction work is constructed such that the elevator is lifted upwards and downwards along the multi-stage assembled block as shown in
FIGS. 1
to
3
.
The elevator car
1
has a pair of guide rail rollers
1
a
for moving along a guide rail
6
of the block
5
. Two guide rail rollers
1
a
are disposed at front and rear with respect to the guide rail
6
, to guide the elevator upwards and downwards. A hook
1
b
is disposed to guide the guide rail
6
, for preventing deviation of the elevator car
1
.
A plurality of motors
2
and pinions
2
a
are employed in the elevator car
1
, for actuating the elevator to be lifted in any desired direction. A plurality of racks
4
is disposed at the block
5
in the vertical direction. Driving of the motor
2
allows the pinions
2
a
to be rotated along the racks
4
, so that the elevator car
1
is lifted upwards and downwards.
Especially the elevator car
1
for use in construction work is required to attention safety since the elevator car is exposed at all times, and nevertheless the brake device is most important.
Conventional brake device of the elevator shows use of a governor
3
. The governor-braking device utilizes centrifugal force, in which the pinion
3
a
of the governor
3
for brake device is engaged with the rack
4
at the block. To the pinion a centrifugal weight is connected.
In case of fall or crash of the elevator due to abnormality such as malfunction or etc., the pinion
3
a
of the governor
3
of the elevator is rotated at high speed by the rack
4
, so that centrifugal weight being spread becomes held onto boss in the brake device to stop the pinion
3
a
and to brake the elevator car
1
.
Because lifting operation of the elevator car
1
is dependent on pinion
2
a
and rack
4
, the longer the elevator is used, the more fatigue the rack and pinion receive. The governor
3
intends to stop the elevator in crash but the rack weakened by fatigue practically receives a heavy impact. As a result, the gear teeth of the rack
4
or pinion
3
a
of the governor
3
become damaged, resulting in fall or crash accident of the elevator. In a normal working condition, the elevator moves smoothly and impact does not harm on the passenger or luggage. However, in case of crash of elevator, heavy impact is accompanied with stop of the elevator by the governor, resulting in severe damage on luggage or passengers.
The building elevator operated by rope also utilizes the brake device by governor.
This construction has a disadvantage of damage of passenger or luggage by heavy impact in stopping the elevator being fallen down.
The present invention is derived to solve the disadvantage of the conventional art and to generate hydraulic pressure after detecting free fall or crash of the elevator and actuate a brake pad by hydraulic pressure, so that impact by sudden brake is relieved to maintain a stable brake interval and prevent the brake device from being damaged by heavy impact caused by sudden brake.
The object of the present invention is accomplished by providing a hollow box-shaped elevator car
1
for holding the passenger or luggage; block
5
including a pair of guide rails
6
for guiding upwards and downwards the elevator car
1
; a plurality of racks
4
disposed at the block
5
along the lifting direction in vertical; at least one motor
2
tooth-engaged with at least one pinion
2
a
at the racks
4
, for lifting upwards and downwards the elevator car
1
; a clutch
12
for controlling power transmission to connect a driving shaft
19
to a driven shaft
20
when the pinions
2
a
and
11
engaged with the racks
4
are rotated at high speed due to elevator drop; hydraulic pump
15
for generating hydraulic pressure from power transmission though a plurality of transmission gears
13
when the clutch
12
delivers rotation; and a plurality of hydraulic cylinders
17
for braking the elevator by brake pad
18
in tight coupled with the guide rails
6
by hydraulic power from the hydraulic pump
15
.
In crash of the elevator, the clutch actuates to operate the brake pad by hydraulic power from the hydraulic pump, thereby receiving impact and protecting passengers or luggage in the elevator.
The elevator is stopped by friction brake with less impact onto the passenger or luggage, so that safety and reliability are improved.


REFERENCES:
patent: 1634865 (1927-07-01), Scollard
patent: 3415343 (1968-12-01), Svensson
patent: 3866717 (1975-02-01), Johansson
patent: 3924710 (1975-12-01), Shohet
patent: 3967703 (1976-07-01), Martin
patent: 4269285 (1981-05-01), Ohkoshi et al.
patent: 4516663 (1985-05-01), D'Alessio et al.
patent: 4856623 (1989-08-01), Romig, Jr.
patent: 5353895 (1994-10-01), Camack et al.
patent: 5366045 (1994-11-01), Liston
patent: 6345547 (2002-02-01), Stoelinga et al.
patent: 10 157939 (1998-06-01), None

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